Question

It is haraam to have
intercourse with one’s wife in her back passage, and the Prophet (peace
and blessings of Allaah be upon him) said that the one who does that is
cursed.

We have quoted the evidence from the Qur’aan and Sunnah to
show that it is haraam, as well as describing some of the evil consequences
of that, in the answer to question no. 1103 and
6792.

Islam has not stipulated any expiation for this action, so
there is no expiation for it apart from repentance and regret, and turning
back to Allaah.

Shaykh Ibn Baaz (may Allaah have mercy on him) was asked:
What is the ruling on having intercourse with a woman in her back passage?
Is there any expiation required of the one who does that?

He replied:

Having intercourse with a woman in her back passage is a
major sin and is one of the most heinous acts of disobedience, because it
was narrated that the Prophet (peace and blessings of Allaah be upon
him) said: “Cursed is the one who has intercourse with his wife in her back
passage.” Narrated by Abu Dawood, 2162; classed as hasan by al-Albaani in
Saheeh Abi Dawood.

And he (peace and blessings of Allaah be upon him) said:
“Allaah will not look at a man who had intercourse with a man or a woman in
the back passage.” Narrated by al-Tirmidhi, 1166; classed as hasan by
al-Albaani in Saheeh al-Tirmidhi.

What the one who has
done that must do is hasten to repent sincerely, which means giving up the
sin and abstaining from it out of respect for Allaah and out of fear of His
punishment, regretting what he has done of that and sincerely resolving
never to go back to it, as well as striving to do righteous deeds. Whoever
repents sincerely, Allaah will accept his repentance and forgive his sins,
as Allaah says (interpretation of the meaning):

“And verily, I am indeed
forgiving to him who repents, believes (in My Oneness, and associates none
in worship with Me) and does righteous good deeds, and then remains constant
in doing them (till his death)”

[Ta-Ha 20:82]

“And those who invoke not
any other ilaah (god) along with Allaah, nor kill such person as Allaah has
forbidden, except for just cause, nor commit illegal sexual intercourse
and whoever does this shall receive the punishment.

69. The torment will be
doubled to him on the Day of Resurrection, and he will abide therein in
disgrace;

70. Except those who
repent and believe (in Islamic Monotheism), and do righteous deeds; for
those, Allaah will change their sins into good deeds, and Allaah is
Oft‑Forgiving, Most Merciful”

[al-Furqaan 25:68-70]

There is no expiation
required of one who has anal intercourse, according to the more correct of
the two scholarly opinions, and his wife does not become haraam to him
because of that, rather she remains his wife. But she does not have to obey
him in this grave evil; rather she is obliged to refuse, and to demand a
annulment of her marriage to him if he does not repent. We ask Allaah to
keep us safe and sound from that.

From Fataawa Islamiyyah, 3/256

Al-Bayhaqi (may Allaah have mercy on him) said:

If he does that (i.e.,
has intercourse with her in the back passage), then he should be punished
(i.e., the judge or ruler should mete out a punishment that will deter him
and others like him), because he has committed a sin for which there is no
stipulated hadd punishment or expiation.

Kashshaaf al-Qinaa’, 5/190

So he clearly stated that it is a sin, but no expiation is
required.

See Ansa al-Mataalib, 4/162; Mughni al-Muhtaaj,
5/624

Secondly:

Many people make the
mistake of thinking that because there is no expiation stipulated for a
particular sin that it is an insignificant matter and is a minor sin. This
way of thinking is not correct. Rather if one were to say that Allaah has
not stipulated any expiation for anal intercourse because it is too serious
to be expiated by any expiation, that would not be farfetched. As Imam
Maalik says concerning swearing a false oath (al-yameen al-ghamoos):
it is too serious to be expiated by any expiation.